October 17

A conquest can be a praiseworthy thing, and there are times when war becomes the powerful basis of peace, and ruin the very means of reconstruction. If, for example, a high-minded sovereign marshals his troops to block the onset of the insurgent and the aggressor, or again, if he takes the field and distinguishes himself in a struggle to unify a divided state and people, if, in brief, he is waging war for a righteous purpose, then this seeming wrath is mercy itself, and this apparent tyranny the very substance of justice and this warfare the cornerstone of peace. Today, the task befitting great rulers is to establish universal peace, for in this lies the freedom of all peoples. 
(‘Abdu’l-Baha, ‘The Secret of Divine Civilization’)